Search results for "RAV"
showing 10 items of 5866 documents
A multiproxy record of palaeoenvironmental conditions at the Middle Palaeolithic site of Abric del Pastor (Eastern Iberia)
2019
This paper presents a multiproxy palaeoenvironmental study from Abric del Pastor (Alcoy, Spain), a rock shelter which has yielded evidence for Middle Palaeolithic human occupation. The sedimentary sequence has been analysed for lipid biomarker n-alkane abundances (ACL, CPI), compound specific leaf wax δH and δC, and bulk organic geochemistry (TOC, %N, %S), providing a record of past climate and local vegetation dynamics. Site formation processes have been reconstructed through the application of soil micromorphology. Analyses of anthracological, microvertebrate and macrofaunal assemblages from selected subunits are also presented here. Our data indicates that a variable climate marked by pr…
Non-supersymmetric Extremal Black Holes: First-Order Flows and Stabilisation Equations
2013
We review the results of [1, 2] on reducing the second-order equations of motion for stationary extremal black holes in four-dimensional \({\textit{N}}\,=\,2\) supergravity to first-order flow equations and further to non-differential stabilisation equations.
NONSINGULAR BLACK HOLES IN PALATINI EXTENSIONS OF GENERAL RELATIVITY
2015
An introduction to extended theories of gravity formulated in metric-affine (or Palatini) spaces is presented. Focusing on spherically symmetric configurations with electric fields, we will see that in these theories the central singularity present in General Relativity is generically replaced by a wormhole structure. The resulting space-time becomes geodesically complete and, therefore, can be regarded as non-singular. We illustrate these properties considering two different models, namely, a quadratic f(R) theory and a Born-Infeld like gravity theory.
Can gravity perturbations explain QPOs?
2007
We show the results of some numerical simulations trying to reproduce the QPO behavior in black hole and neutron star sources. Our simulations are based on the idea that a nearly periodic luminosity oscillation can be obtained from a perturbation of the source gravitational field with a sinusoidal time behavior. We find that some specific features of the QPO phenomenon can be described by this simple model, but the required amplitude of the gravity perturbation is more than 1% of the unperturbed gravitational field. If the hypothesis is formed that such a perturbation is due to a density fluctuation (of the accretion disk or the source itself, in the case of the neutron star) going around t…
Blackwood's Magazine - "Nodier's Promenade"
2013
We have translated and annotated an extended review from "Blackwood's Edinburgh Magazine" reporting on the publication, in English translation, of "Promenade de Dieppe aux montagnes d'Écosse" by Charles Nodier ("Promenade from Dieppe to the Mountains of Scotland", Edinburg, Blackwood, London, Cadell, 1822). The reference of the original article is as follows: "Nodier's Promenade", Blackwood's Edinburgh Magazine", march 1822, vol. XI (January - June 1822).
BIOMARKERS OF UROTHELIAL DAMAGE IN PATIENTS TREATED BY ADJUVANT INTRAVESICAL THERAPY
2013
Introduction/Aim: Chemotherapy or BCG given intravesically to prevent recurrence after transurethral resection (TUR) of non-muscle invasive bladder cancer (NMI-BC) cause frequent, sometime severe, local toxicity. As a consequence, many patients do not complete the planned treatment (1). A major challenge for the urologists is to identify an early biomarker of urothelial damage to recognize and prevent local toxicity improving patient’s compliance. The purpose of our research was to investigate the relation between urothelial injury by intravesical treatment and the expression of potential biomarkers in urine and/or in barbotage solution. The urinary HB-EGF expression in interstitial cystiti…
Considerazioni su un caso di schistosomiasi urinaria.
2005
Urinary tract schistosomiasis is a parasitic disease caused by S. haematobium with a wide range of clinical manifestations related to the mucosal and submucosal granulomatous lesions of the bladder. It affects about 80 million people in Africa, Middle-East and India, while in Italy it is rarely seen among immigrants from endemic areas and returning travellers. The authors describe a case occurred in a 26 year old man, recently emigrated from a rural area of Ghana. He had the symptoms of a haemorrhagic cystitis. Cystoscopy and biopsy showed granulomatous lesions of bladder with calcified eggs. Microscopic examination of urine was positive for Schistosoma haematobium eggs. The therapy with Pr…
S9-Fibronectin, EGF-R, HB-EGF:biomarkers of urothelial damage during intravesical adjuvant therapy?
2013
Intravesical chemotherapy and immunotherapy with BCG represent the standard therapy to prevent recurrence after transurethral resection (TUR) of non-muscle invasive bladder cancer (NMI-BC). Maintenance for at least one year is considered the best regimen. Noteworthy, a relevant number of patients do not complete the planned treatment due to local toxicity of the drug given intravesically1, 2. A major challenge for the urologists is to identify an early urothelial damage biomarker to prevent severe local toxicity requiring treatment interruption and to improve patient's compliance. The preliminary purpose of our research was to verify the possible correlation between urothelial damage induce…
Acute changes of systemic parameters in tumour-bearing rats, and of tumour glucose, lactate, and ATP levels upon local hyperthermia and/or hyperglyca…
1991
Arterial blood pressure and relevant parameters of the arterial blood (O2 and CO2 tensions, pH, haematocrit, serum electrolytes and osmolality) were determined in tumour-bearing rats upon local hyperthermia (HT) and/or hyperglycaemia (HG). Tumour heating was performed in a saline bath (44 degrees C) for 120 min; hyperglycaemia was induced by i.v. infusion of 40% glucose solution for 150 min [blood glucose levels: 35-40 mM during heating; total amount of glucose: 1.19 g/100 g body wt.; infusion rates: 0.31 ml (100 g body wt.)-1 min-1 for 2 min, 0.02 ml (100 g body wt.)-1 min-1 for 88 min, and 0.01 ml (100 g body wt.)-1 min-1 for 60 min]. Immediately after treatment, glucose, lactate and ATP …
Feeding enhances extracellular lactate of local origin in the rostromedial hypothalamus but not in the cerebellum.
1999
Abstract The use of brain microdialysis together with chronic vascular catheterization allowed us to assay extracellular fluid lactate (ECF L ) in both the ventromedial–paraventricular (VMH–PVN) area of the hypothalamus and the cerebellum, in parallel with measures of plasma levels, and in relation to food intake. A 45 min scheduled meal increased VMH–PVN ECF L by 28%. This increase was not observed in the cerebellum. The prandial increase in plasma glucose (43%, from 4.74 to 6.77 mM) and lactate (84%, from 0.83 to 1.53 mM) showed a different temporal pattern and lasted longer than that of the ECF L . Glucose delivery by reverse dialysis for 45 min into the VMH–PVN area increased ECF L by 4…